Heating-furnace.



L. E. RUSSELL.

HEATING FURNACE.

APPLICATION FILED MAR. 18, 1915.

1 5, 1 99. Patented Feb. 6, 1917.

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L. E. RUSSELL.

HEATING FURNACE.

APPLICATION FILED MAR. 18. 1915.

Patented Feb. 6, 1917.

2 SHEETS-SHEET 2 Ill/VE/VTOI? Lerog E Russell ll ITO/WE V8 LEROY EDGARRUSSELL, OF DEPOSIT, NEW YORK.

HEATING-FURNACE.

Application filed March 18, 1915.

expensive to manufacture, and of durable and substantial design.

A more specific object of the invention is the provision of a fire-box,combustion chambeiaand aslrbox ofnovel design, whereby a largeradiatingsurface. is provided for enabling a higher abstraction of heatfrom the fuel, there being a novel arrangement of smoke fines inconnection with the combustion chamber, whereby the air passingthroughathe furnace is effectively heated.

lVith such objects in view, and others which will appear as thedescription proceeds, the invention comprises various novel features ofconstruction and arrangement of parts which will be setsforth withparticularity in the following description and claim appended hereto.

in the accompanying drawing, which illustrates one embodiment of theinvention and, wherein similar characters of reference indicatecorresponding parts in all the views,

Figure 1 is acentral vertical section of the furnace;

Fig. 2 is a horizontal section on the line 22, Fig. 1, through theash-box, drawn. on a reduced scale;

Fig. 3 is a horizontal section on the line 33, Fig. 1, through thecombustion cham--' ber portion of the furnace; and

Fig. 4 is a horizontal section on the line l-l-, Fig. 1, through thefire-box.

Referring to the drawing, 1 designates the casing of the furnace, whichhas a fresh air inlet 1 at the bottom of its rear portion, and at thetop it is provided with numerous hot air distributing ducts 2 arrangedin any suitable manner. The internal structure comprises an ash-box 3, afire-box 4:, a combustionchamber 5 and a surrounding annular smoke flue.

Th a 3 iS it metal casting or other Specification of Letters Patent.

Patented nee. e, ieir.

Serial No. 15,259.

structure. supported on legs or equivalent means 7, and in horizontaldimensions it is considerably smaller than the casing, so that amplespace is provided for ermitting the incoming air to circulate around theashbox at all points.

The front of the ash-boXis provided with an opening 8 at the front wallof the casing A, and. this opening is provided with, a door 9. The rearportion of the ash-box is provided with: external vertically disposedribs 10 for increasing the heat-conducting and radiating surface. At thetop of the ash-box is a grate 11 ofsuitable construction for holding thefuel.

The fire-box 4: is a cylindrical casting and has on its outside aplurality of vertical ribs 12 for increasing the heat-conducting andradiating surface, and this fire-box is in diameter considerably smallerthan the casing A, for allowing air to circulate freely at all pointsalong the ribs 12. The the boX rests on and is fastened to the ash-boxand it in turn supports the combustion chamber 5. This combustionchamber is formed by an approximately cylindricalshaped body 13 having adome 14 and it has on its vertical wall internal and eX- ternal verticalribs 15 and 16 for increasing the transmission of heat from the firegases to the air to be heated. The dome lat also has internalandexternal ribs 15 and 16. The combustion chamber is of approXL matelythe same diameter as the fire-box, and therefore the air to be heatedflows freely upwardly along the outside of the combustion chamber, thedome of which is somewhat below the top of the casing A to provide adistributing space for the hot air. Disposed in the same horizontalplane with the combustion chamber and concentrically arranged withrespect thereto are two oppositely disposed approximately semi-circularportions 17 and 17 of the smoke flue which communicate with thecombustion chamber through an opening 18 at the front of such combustionchamber. The casing is en larged at its upper portion to accommodate thesmoke flue, and at the bottom of the enlargement is an annular shoulderover which the smoke flue lies. The inner circular wall of the smokeflue is of substantially the same diameter as the bottom portion of thecasing, so that a straight unbroken upflow of the air through the casingis pr l i l l I vided. The fines are formed by concentric walls 19 and20, the front ends of the wall' 19 being united with the cylindricalwall of the; combustion chamber by the bends 21 which form oppositewalls of-the opening 18, which latter serves as an outlet for the firegases,and also as a feed opening for the coal. Therefore the opening 18is in line with an opening 22 in the front portion of the wall 20, andprovided for this opening 22 is a door 23 through which the furnace iscoaled. The annular horizontal plate 24 in line with the bottom of thecombustion chamber connects the three concentric walls 13, 19 and andcuts off co1nn'iunication between the hot air space of the chamber andthe combustion system.v The portion of the horizontal plate 24 betweenthe walls 13 and 19 has openings 25, so that the air can pass upwardlybetween. the com bastion chamber 5 and the sn okelflue, the tops of thefines being closed by a horizontal web-26. The structure botweenthe conibustion chamber and flue isstiflened by radial connecting webs-'27 asshown in Figs. 1 and 2, these websbeingivertical so as not to interferewith the free upward flow of the air that being heated Since theairflows between the flue andthe combustionchamber the air iseffectively heated, and

by the time'the fire gases reach the outlet 28, where the flue sectionsIT-and '17 join,

a large amount of the heat is abstracted. The ribs of the combustionchamber assist materially 1n transmitting the heat of combustion tothe'air.

From the foregoing description taken in connection with the accompanyingdraw-; ing the advantages of the construction and method ofoperationwill be readily understood by those skilled in the art to which theinvention appertains, and while I have described the principle ofoperation, to-

gether with the structure which I now consider to be the best embodimentthereof, I desire to have it understood that the structure shown ismerely illustrative and that Copies of this patent may be obtained forfive cents each, by addressing the Commissioner of Iate'nts,

Patent such changes may be made when desired as are within the scope ofthe appended claim.

Having thus described my invention, I

claim as new and desire to secure by Letters A furnace comprising acasing circumferentially enlarged at its upper portion andhaving a coldair inlet atits bottom and hot air outlets at the top, there being anannular shoulder between the bottom of the enlarged portion and thelower portion of the casing, and'a structure within the casing forburning fuel, said structure comprising an ash-box, a fire-box mounted.thereon and having a smooth interior and vertical integral .ribs on itsouter surface,

there being a substantial space'between the w: ll of the casing and theribs onthe firebox, a combusthm chamber supported on the top of thefirebox and having internal .7 i -.1

and external. ribs on its circumferenceand unobstructed up-fiow of airfrom the bottom ofthe casing to the space-between the top thereof andthe top of the combustion chamber, said flue being disposed. in theenlargedpart of the casing anddirectly over the said shoulder, therebeing an opening at the'juncture of the flue with the cornbus-' tionchamber through which' coal is supplied'--- to th'e'fireeboxf 1 I p Intestirnoiiiy whereof I have signed'my name togthis' specification in the7 presence of-two' subscribing witnesses.

LEROY EDGAR RUSSELL. Witnesses:

EBENEZER D. CUMMING, MARTHA SoHnrDEL.

Washington, D. G.

